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Shutemov" , Andi Kleen , tony.luck@intel.com, marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com Subject: Re: [PATCH Part1 v5 30/38] x86/compressed/64: store Confidential Computing blob address in bootparams Message-ID: <20210827190955.fc5eyvk2mmtuawwz@amd.com> References: <20210820151933.22401-1-brijesh.singh@amd.com> <20210820151933.22401-31-brijesh.singh@amd.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: SN6PR08CA0014.namprd08.prod.outlook.com (2603:10b6:805:66::27) To CH2PR12MB4133.namprd12.prod.outlook.com (2603:10b6:610:7a::13) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost (165.204.77.11) by SN6PR08CA0014.namprd08.prod.outlook.com (2603:10b6:805:66::27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4457.17 via Frontend Transport; Mon, 30 Aug 2021 15:56:12 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 5a530821-f2b7-42d6-6fc5-08d96bceb0ff X-MS-TrafficTypeDiagnostic: CH2PR12MB4246: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:336; 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> > } > > > > -#ifdef BOOT_COMPRESSED > > static struct setup_data *get_cc_setup_data(struct boot_params *bp) > > { > > struct setup_data *hdr = (struct setup_data *)bp->hdr.setup_data; > > @@ -888,6 +887,16 @@ static struct setup_data *get_cc_setup_data(struct boot_params *bp) > > * 1) Search for CC blob in the following order/precedence: > > * - via linux boot protocol / setup_data entry > > * - via EFI configuration table > > + * 2) If found, initialize boot_params->cc_blob_address to point to the > > + * blob so that uncompressed kernel can easily access it during very > > + * early boot without the need to re-parse EFI config table > > + * 3) Return a pointer to the CC blob, NULL otherwise. > > + * > > + * For run-time/uncompressed kernel: > > + * > > + * 1) Search for CC blob in the following order/precedence: > > + * - via linux boot protocol / setup_data entry > > Why would you do this again if the boot/compressed kernel has already > searched for it? In some cases it's possible to boot directly to kernel proper without going through decompression kernel (e.g. CONFIG_PVH), so this is to allow a way for boot loaders of this sort to provide a CC blob without relying on EFI. It could be relevant for things like fast/virtualized containers. > > > + * - via boot_params->cc_blob_address > > Yes, that is the only thing you need to do in the runtime kernel - see > if cc_blob_address is not 0. And all the work has been done by the > decompressor kernel already. > > > * 2) Return a pointer to the CC blob, NULL otherwise. > > */ > > static struct cc_blob_sev_info *sev_snp_probe_cc_blob(struct boot_params *bp) > > @@ -897,9 +906,11 @@ static struct cc_blob_sev_info *sev_snp_probe_cc_blob(struct boot_params *bp) > > struct setup_data header; > > u32 cc_blob_address; > > } *sd; > > +#ifdef __BOOT_COMPRESSED > > unsigned long conf_table_pa; > > unsigned int conf_table_len; > > bool efi_64; > > +#endif > > That function turns into an unreadable mess with that #ifdef > __BOOT_COMPRESSED slapped everywhere. > > It seems the cleanest thing to do is to do what we do with > acpi_rsdp_addr: do all the parsing in boot/compressed/ and pass it on > through boot_params. Kernel proper simply reads the pointer. > > Which means, you can stick all that cc_blob figuring out functionality > in arch/x86/boot/compressed/sev.c instead. Most of the #ifdef'ery is due to the EFI scan, so I moved that part out to a separate helper, snp_probe_cc_blob_efi(), that lives in boot/compressed.sev.c. Still not pretty, but would this be acceptable? /* * For boot/compressed kernel: * * 1) Search for CC blob in the following order/precedence: * - via linux boot protocol / setup_data entry * - via EFI configuration table * 2) If found, initialize boot_params->cc_blob_address to point to the * blob so that uncompressed kernel can easily access it during very * early boot without the need to re-parse EFI config table * 3) Return a pointer to the CC blob, NULL otherwise. * * For run-time/uncompressed kernel: * * 1) Search for CC blob in the following order/precedence: * - via boot_params->cc_blob_address * - via linux boot protocol / setup_data entry * 2) Return a pointer to the CC blob, NULL otherwise. */ static struct cc_blob_sev_info *sev_snp_probe_cc_blob(struct boot_params *bp) { struct cc_blob_sev_info *cc_info = NULL; struct cc_setup_data *sd; #ifndef __BOOT_COMPRESSED /* * CC blob isn't in setup_data, see if boot kernel passed it via * boot_params. */ if (bp->cc_blob_address) { cc_info = (struct cc_blob_sev_info *)(unsigned long)bp->cc_blob_address; goto out_verify; } #endif /* Try to get CC blob via setup_data */ sd = get_cc_setup_data(bp); if (sd) { cc_info = (struct cc_blob_sev_info *)(unsigned long)sd->cc_blob_address; goto out_verify; } #ifdef __BOOT_COMPRESSED cc_info = snp_probe_cc_blob_efi(bp); #endif out_verify: /* CC blob should be either valid or not present. Fail otherwise. */ if (cc_info && cc_info->magic != CC_BLOB_SEV_HDR_MAGIC) sev_es_terminate(1, GHCB_SNP_UNSUPPORTED); #ifdef __BOOT_COMPRESSED /* * Pass run-time kernel a pointer to CC info via boot_params for easier * access during early boot. */ bp->cc_blob_address = (u32)(unsigned long)cc_info; #endif return cc_info; } > > Thx. > > -- > Regards/Gruss, > Boris. > > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpeople.kernel.org%2Ftglx%2Fnotes-about-netiquette&data=04%7C01%7Cmichael.roth%40amd.com%7C1c87c1e207d64d80bae308d9696503b4%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637656704870745741%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=R3pm8Xf3f5B%2Fm7IDpL%2BiFS0kUdCMmUlhtJFXCROh4YA%3D&reserved=0